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Signals in Stem Cell Differentiation on Fluorapatite-Modified Scaffolds.

T Guo1,2,3, G Cao3, Y Li2,4

  • 11 Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China.

Journal of Dental Research
|July 12, 2018
PubMed
Summary
This summary is machine-generated.

Fluorapatite-modified scaffolds enhance dental stem cell differentiation via hedgehog, insulin, and Wnt pathways. Inhibiting these pathways reduces osteogenic potential and mineralization, highlighting their crucial role.

Keywords:
autophagybiomaterial(s)osteogenesissignal transductiontissue engineeringtissue scaffolds

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Area of Science:

  • Biomaterials Science
  • Stem Cell Biology
  • Tissue Engineering
  • Molecular Signaling

Background:

  • Fluorapatite (FA)-modified polycaprolactone (PCL) nanofibers serve as inductive scaffolds for bone and tooth regeneration.
  • Understanding the molecular mechanisms driving stem cell differentiation on these scaffolds is crucial for optimizing their efficacy.

Purpose of the Study:

  • To elucidate the specific signal transduction pathways involved in osteogenic differentiation of human dental pulp stem cells (DPSCs) induced by FA-modified PCL scaffolds.
  • To investigate the role of hedgehog, insulin, and Wnt signaling pathways, as well as autophagy, in this process.

Main Methods:

  • Human dental pulp stem cells (DPSCs) were cultured on FA-modified PCL nanofiber scaffolds.
  • Human Signal Transduction PathwayFinder RT² Profiler PCR Array was employed to analyze gene expression.
  • Perturbation studies were conducted on hedgehog, insulin, and Wnt pathways, alongside analysis of autophagy markers (LC3-II).

Main Results:

  • Key genes in hedgehog, insulin, and Wnt pathways showed increased expression at day 14, coinciding with DPSC osteogenic differentiation.
  • Inhibition of these pathways led to decreased alkaline phosphatase (ALP) activity, osteopontin (OPN) expression, and LC3-II levels.
  • Perturbation groups failed to show mineralization (Alizarin Red and von Kossa staining) at day 28.

Conclusions:

  • The osteogenic differentiation and mineralization of DPSCs on FA-modified PCL scaffolds are positively modulated by the hedgehog, insulin, and Wnt signaling pathways.
  • These signaling pathways appear to be coordinated with and/or mediated by the cellular autophagy process.
  • Targeting these pathways offers potential strategies for enhancing bone and tooth regeneration using engineered scaffolds.